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CVE-2026-93869— Cotonti through 1.0.0 Open Redirect via Unanchored cot_url_check() Regex

Quick assessment

Affected
Cotonti Cotonti
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cotonti 1.0.0 及之前版本中， 函数存在开放重定向漏洞，该函数使用正则表达式验证重定向目标，但该正则表达式缺少字符串结束锚点。攻击者可以通过提供以站点域名开头的主机名来绕过重定向防护，从而通过评分插件或其他重定向调用方将用户重定向到攻击者控制的主机上。

CVSS 6.1 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-93869

Vulnerability Information
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Vulnerability Title
Cotonti through 1.0.0 Open Redirect via Unanchored cot_url_check() Regex
Source: CVE Program / CVE List V5
Vulnerability Description
Cotonti through 1.0.0 contains an open redirect vulnerability in the cot_url_check() function that validates redirect destinations using a regular expression lacking an end-of-string anchor. Attackers can bypass the redirect guard by supplying hostnames beginning with the site domain to redirect users to attacker-controlled hosts through the ratings plugin or other redirect callers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cotonti Cotonti 0 ~ 1.0.0 -

II. Public POCs for CVE-2026-93869

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-93869

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Patches & Fixes for CVE-2026-93869 (1)

Vendor Pages for CVE-2026-93869 (1)

Other References for CVE-2026-93869 (3)

Same Patch Batch · Cotonti · 2026-09-18 · 6 CVEs total

CVE-2026-93868 8.1 HIGH Cotonti through 1.0.0 Predictable Password Recovery Token via Weak PRNG
CVE-2026-93872 7.5 HIGH Cotonti 1.0.0 PHP Object Injection via Comments Plugin Edit Action cb Parameter
CVE-2026-93871 5.4 MEDIUM Cotonti through 1.0.0 Stored Open Redirect via Page redir: Prefix
CVE-2026-93870 4.3 MEDIUM Cotonti through 1.0.0 Cross-Site Request Forgery in the Ratings Plugin AJAX Handler
CVE-2026-93873 4.3 MEDIUM Cotonti through 1.0.0 Cross-Site Request Forgery in the Contact Plugin

IV. Related Vulnerabilities

Same product: Cotonti
Same vendor: Cotonti
Same weakness: CWE-601

V. Comments for CVE-2026-93869

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